I've updated the weights at 6 weeks and one day (sorry I was a day late). When others start adding to the journal, I will ask that a bunch of the non-journal type entries in this thread be removed.
They put on an average of one pound each this week, growing from an average of 2 lb 7 oz to an average of 3 lb 7 oz. They did this on an average of 2.35 lbs of feed each.
I moved them from the barn to an outside run today after weighing them. There's not much shelter in the run and there is cold and rain in the forecast for the weekend, so I either build them more shelter tomorrow or move them back inside. (I want a separate run, so building a better shelter should win out over the ease of moving them inside.)
I started noticing a few larger, redder combs at about 5 weeks. I haven't tried, but think I could get a pretty accurate male/female count. Next week, I'll try to separate them before I weigh them and see what the difference is.